That is so funny you mention the pool as a gateway pool, because we have been discussing how by next summer this one will be to the hips of our shortest child when filled completely. A couple questions i have after reading three link sent earlier by the pooldr, and if you have some experience using polyquat. That was the only thing i read that i keep mulling over in my head. Also, what do y'all think of this...just curious, my husband says he can rig up another similar small filter to the pool this year so the pool will be using two of the smaller filters. Riveting how y'all feel about that or if it still wouldn't be enough. Thanks for all the feedback and please know i love learning from other experience.